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Investigators are now trying to find witnesses who saw exactly what happened.

There is no crossing guard at the intersection, but there is a yield sign next to it and that is a crucial point to the investigation.

Jaden Vasquez Vallejo was on his way to Meadow Woods Elementary, less than a mile from the intersection, when he was struck and killed, troopers said.

Jaden's older brother, who is a fifth-grader at the same school, and two other children were also riding their bikes.

The brother told troopers that he and his brother were wearing their helmets and got off their bikes to cross the intersection. The children are the only known witnesses to the accident.

"The fifth grader told the investigating trooper that his brother and him got off the bikes to walk across the road as his brother entered the cross walk the front of the semi-truck struck him and ran him over," said Florida Highway Patrol Sgt. Kim Montes.

The truck driver is 47-year-old Raiford Reynolds, of Winter Haven, and the Florida Highway Patrol said he did not yield right of way and may have had an obstructed view because the truck trailer is about 8 feet off the ground, so he probably couldn't see the children, investigators said.

FHP said they also found hand prints under the semi-truck and they now believe those to be of the surviving brother trying to save Jaden.